Now that Fortnite is back on iOS with Apple's approval of the game, Microsoft is jumping in to try to extend its ability to sell games on the platform through its Xbox app.Microsoft on Tuesday filed an amicus brief in district court in support of Fortnite publisher Epic Games saying that Apple has "stymied" its efforts to sell games through its mobile Xbox app on iOS.

Microsoft pinpoints Apple and its old App Store policies as the main culprits that prevented the launch of a mobile-centric Xbox game and app store.

Microsoft is getting rid of developer onboarding fees for the Microsoft Store on Windows, the digital distribution platform for its flagship operating system.